不同传输模型条件下的孔径平均效应分析  

Analysis of Aperture Averaging Effect under Different Transmitting Beam Models

作　　者：吴晓军[1,2] 王红星[1,2] 孙雪[3] 宋博[1,2] 

机构地区：[1]海军航空工程学院电子信息工程系 [2]山东省信号与信息处理重点实验室 [3]中国人民解放军91960部队

出　　处：《激光与光电子学进展》2011年第12期33-36,共4页Laser & Optoelectronics Progress

基　　金：山东省"泰山学者"建设工程专项经费资助课题

摘　　要：在无线光通信中,通信系统发射的光束通常近似看作平面波或球面波,而实际的发射光束是高斯波束,所以在研究通信系统性能指标时必然会存在差异。运用理论分析和实验仿真的方法,在不考虑湍流内、外尺度影响和弱湍流的前提下,对比分析了平面波、球面波以及高斯光束模型条件下孔径平均效应的差异。在此基础上,进一步分析了三种传输模型在误码率(BER)性能方面的差异。结果表明,高斯波束条件下孔径平均对误码率的影响明显,最先达到饱和状态,球面波次之,平面波较为平缓。The transmitting beams are usually approximated as plane wave or spherical wave in free space optical communication （FSO） systems. But the actual beam is a Gaussian beam, and there are many differences when we study the performance of FSO system with the approximation model. By using the methods of theoretical analysis and simulation, without considering the impact of the inner and outer scales of turbulence, we analyze the difference of aperture averaging effect among different transmitting beams. The differences of bit-error rate （BER） performance are then analyzed. The results show that Gaussian wave has apparent impact on the improvement of BER performance by aperture averaging, and saturation is reached firstly, followed by spherical wave. Plane wave is relatively gentle.

关 键 词：光通信 无线光通信 传输波束 孔径平均 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]